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Edit: I'm leaving the comment as penance but as https://news.ycombinator.com/item?id=39610130 points out, this is an old message about an old update, not the current one.

A short update from meta with some initial high level technical details:

https://m.facebook.com/nt/screen/?params=%7B%22note_id%22%3A...

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That's from 2010.

edit: https://www.cnn.com/2010/TECH/social.media/09/24/facebook.ou...

You're absolutely right, thanks, my mistake trusting random URLs on HN/the internet!

So it's a bug of the "automated remediation that makes things worse" family.

This system that checks for invalid values in the cache looks like a very bad idea in the first place as in my understanding it checks things beyond "is the cache up to date?".

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